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A *numeric constant* stands for a number. This number can be an
integer, a decimal fraction, or a number in scientific (exponential)
notation.^{30}
Here are some examples of numeric constants that all
have the same value:

105 1.05e+2 1050e-1

A *string constant* consists of a sequence of characters enclosed in
double quotation marks. For example:

"parrot"

represents the string whose contents are ‘`parrot`’. Strings in
`gawk`

can be of any length, and they can contain any of the possible
eight-bit ASCII characters, including ASCII NUL (character code zero).
Other `awk`

implementations may have difficulty with some character codes.

The internal representation of all numbers, including integers, uses double-precision floating-point numbers. On most modern systems, these are in IEEE 754 standard format. See Arbitrary Precision Arithmetic, for much more information.